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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b4cab97fea102e49aa130b5689899e16ec915c1843a94cc2b49b0373c76003' 
  AND token = 'fLT0Ca0s9xpWQRdY0stvJuEyKSxi6f3zTe+XJxxrSr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}